It's called hypoxemia, it's low levels of oxygen in the blood, to be more specific, it's oxygen loss in your blood from your arteries. It can cause respiratory disorders, and tissue hypoxia, as a result of the blood not providing much oxygen to your body.
I hope I helped :)
Answer:
don't know for sure sure but i would think branching
Explanation:
I think this cause of subspecies ( Bengal, Sumatran and Siberian tigers)
